Collapsible and portable core form



Dec. 6, 1927. 1,652,081

H. J. YAGER COLLAPSIBLE AND PORTABLE CORE FORM Filed Sept. 50 1926 2 Sheets-Sheet 1 Qwmnioz Ell dyer. I 1

Dec. 6, 1927. 1,652,081

H. J. YAGER COLLAPSIBLE AND PORTABLE CORE FORM Filed Sept. so. 1926 2 Sheets-Sheet 2 Z7 la 29 f7 t I Jiq 3 x ,5. 32 $9.4.

Patented Dec. 6, 1927.

UNITED STATES 1,652,081 PATENT O FFlfCE.

HARVEY J. YAGER, OF SEATTLE, WASHINGTON,

- COLLAPSIBLE AND PORTABLE'CORE roman Application filed September so, 1926; Serial in. 138,689.

This invention relates to collapsible and portable core forms for molds of that type used in building concrete chimneys, elevator, shafts and otherhollow structures, and more particularly to improvements in the collaps in the removable corner strips shall each embody right angularly related members having their vertical edges beveled for contact with thebeveled vertical edges of the sides of thecore form. V

A further object of the invention is to improveand simplify the. means for sup porting thecore form in the structurebeing built, and to attain this'end comprehends the employmentof beams each consisting of but a single member and provided at its ends. with hooks adapted to be removably engaged with eyes or loops 'carriedby the d form and a finished section of a chimney or' outside form,

structure being built.

With the foregoing and other objects in view, the nature of which will become apparent as the description proceeds, the invention consists of the 'novelconstruction, combination and arrangement of parts hereinafter fully described and claimed, and illustrated. in the accompanying drawings, wherein: I I

1 Figurel is a sectional view taken on a plane extending vertically through thc core elevator shaft, the core form being shown in position to permit the building of an other section of the chimney or elevator shaft,

Figure 2 is a sectional .view taken on a plane extending horizontally through the coreform, chimney or elevator shaft and .Figure 3. is a detail sectionalview taken on the horizontal plane indicated by the line 83 of Figure 1, I Figure .4 is a similar View taken on the vertical plane indicated by the line 44 of Figure 3, and v Figure 5 is a detail plan View ofthe cap. Corresponding and like parts are referred to in the following description, anddesignated in the several views of the accon'1-' panying drawings, by similar reference characters.

i The mold of which the core form forms part includes an outside form which is of theusual construction and comprises sheeting boards 1, st-uds2 and wale pieces 3.

. The coreform comprises opposite sides {1 and 4 and opposite sides 5 and 5 The sides 4.5 contact at diagonally opposite corners of the core form, and at the other dlagonally opposite corners of the core form the vertical edges of the sides are spaced and beveled as shown at 6, Strips 7 each of which embodies right angularly related members, areremovably positioned" at said other diagonally opposite-corners of the core form. Thecorner strips 7 y are of a length equal to the vertical dimension of the core form, and their-vertical edges are beveled and contact withthe beveled edges 6 of the sides 4-5 Vale pieces 8 are secured to the sides 4 and 4%, and wale pieces 9 to the sides 5 and 5 The wale pieces 8 terminate short of the vertical edges of the sides 4 and 4 and the ends thereof are-inclined with respect to the vertical. The wale pieces 9 extend to the vertical edges of the sides 5 and 5?, and are provided at their ends with recesses 10 for the reception oftheends of the wale pieces 8. The recesses 10 present each wale piece 9'with shoulders 10 and 10 and extensions 10 of which the latter have vertical inner sides. The shoulders 10 arejvertical and contact with the wale pieces 8, and the shoulders 10" are inclined with respect to thevertical and spaced from these wale pieces. At diagonally opposite corners ofthe core form, the shoulders 10 of the Wale pieces 9 contact with the wale pieces-8, and atthese points wedges 11 are positioned between'the ends of the walepieces 8 and-the extensions 7 i 10 of the wale pieces 9. 'At the other'diago'nally opposite corners ofthe core form, wedges 12 arepositioned between the wale pieces 8 and the shoulders 10 of the wale' pieces 9, and wedges 13 are positioned be-- tween the ends of the wale pieces 8 and the extensions10 of the wale pieces 9; The. shoulders 10 ofthe lowermost wale pieces .9 and the ends of the lowermost wale pieces 8 incline downwardly and outwardly so as topermit the wedges between these parts to be displaced in adownward direction, these wedges being secured against casual 'displacement by nails 14. In the lower por-' tion of the core form there is-comparatively little room in which to work, and this arrangement of the lowermost wedges permits them to be easily and quickly displaced when it is desired to take the core form apart after completing a section of the structure being molded. The arrangement of the ends of the wale pieces 8 and 9 in overlapping relation together with the wedges 1 1, 12 and 13 render it impossible for the pressure exerted on the core form. by the concrete to move the sides 4 5 outyof alinement at the corners thereof. a

To hold the sides 4L-5 against outward displacement while assembling the core form and'pouringr the concrete, there is provided a cap 15 which is in the form at an open frame and the sides of which are of angular form in Cl'OSSSOCtlOll. The up 15 is adapted to be applied to the upper end of the core form with the horizontal members 15 of its sides in contact with the upper edge of the core form and with the vertical members 15" of its sides in contact with the outer surfaces of the core form. The cap 15 is preferably made of metal, and the weight thereof maintains it in place against casual displacement.

The core form is adapted to be used for building an entire chimney, elevator shaft or other hollow structure. After a section of the structure is completed, the outside form and core form are taken apart and rcmovedand again erected and supported in an upwardly extending position with respect to the completed structure. as clearly illustrated in Figure 1. In this figure and in Figure 2, 16designates the partly completed structure.

The core form is supported by scafi'old planks 17 which are in turn supported by beams 18. The planks 17 and beams 18 are supported within the upper end of the completed section of the structure 16, and the beams, ofwhich cachconsists of but a single member, are removably connected to supporting; eyes or loops 19 which are embedded in the structure during; the erection thereof, The beams 18 are removably connected to the eyes or loops 19 by the hooked terminals Qt) ofplates or shoes 21 secured tothe under sides of the beams by screws and eye bolts The eye bolts may be used for the .40 purpose of supporting a scaffold within the structure 16, and pass entirely through the beams 18 and plates or shoes 21. Nuts 24 applied to the eye bolts 23 and contacting with the plates or shoes 21, and nutsBli applied to said bolts and contacting with the upper sides of the beams 18, function to firm- 1y secure the plates or shoes and eye belts in place. To permit the scalfold planks 17 and beams 18 to be removed from the completed section of the structurelG after the remcwal of the core form, cables 26 are provided and are connected to said planks and beams.

Opposite sides of the core form are proen'ibedded in each ction of the structure 16 during; the erection of the section. The seat told planks 17 and beams may therefore be supported within a completed section oi the structm'e 1(3 111 a. manner to support the core form in upwardly projected relation wuh rcspcctto the section. To prevent mortar 'l'rom accunmlating in the recesses 27,

and thus hacking the cyesor loops 19 to the core term, the recc sea are closed by plates 25% after the eyes or loops are ins *rted therein, and the plates are secured in place by nails 9.9. lrljorizontal reen'lorcing bars 30 are embedded in the structure 16 immediately below the eyes or loops 19 and inwardly of their anchoring elements 19", and to permit of the ready application of these parts they are secured to the eyes or loops by tie wires 81. Vertical reenlorcing bars 32 for the structure 16 are secured to the horizontal reenttorcing bars 30 by tie wires 33.

From the foregoing descri ition, taken in connection with the accompanying drawings, it will be understood that the core form may be readily taken apart and removed from a completed section of the structure, that the core form may be readily erected and sup ported from and in upwardly projecting rclation to such section, and that as the section of the structure is completed the eyes or loops 19'are embedded therein so as to make provision for supporting the beams 18. The transverse mei'nbers of theeyes or loops 19 are spaced a considerable distance from the inner faces of the completed structure in order to enable the hooked terminals 20 of the plates 21 to be readily engaged with the eyes or loops. The eyes or loops 19 cannot pull out of the structure muler the load sus tained thereby. due to their anchoring elements 19 and the reenlm-cing bars 30. i

It should be understood that the drawings are merely illustrative and do not pretend to give exact proportions. Furthermore, the said drawings are illustrative of a preferred construction it being my expectationthat various changes and modificationsmaybe made without departing from the spirit and scope of my invention. 1

\Vhat is claimed is 1. In combination, a coreform, men'lbers removably connected to the core form and adapted to be embedded in the structure being built, and a core form supporting member adapted to be supported from the structure bysaid first named members;

1,652,081 I i i 8 2. In combination, a: core form, eyes readapted to be embedded in the structure movably secured to the core form and adaptbeing built, said eyes having anchoring eleed; to be embedded in the structure being ments angularly related thereto, and a beam 10 built, and a. core form supporting beam proprovided with hooks removably engaged vided with terminal hooks adapted to be enwith the eyes. gaged'with said eyes. In testimonywhereof I affix my signature.

A] core form support comprising eyes v HARVEY J. YAGER. 

